@misc{indiciae9509773395ec,
  title = {NASA's Chemical Transfer Propulsion Program for Pathfinder},
  author = {Hannum, Ned P. and Berkopec, Frank D. and Zurawski, Robert L.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890017505},
  note = {Source identifier: 19890017505}
}